Niagara's Power One High-Efficiency Toilet Uses Only 1.0 Gallon Per Flush, Making It The Lowest-Flushing Pressure-Assist Toilet Available On The Market! The Toilet Uses Up To 71% Less Water Than Older Conventional Toilets, Making For Huge Water And Utility Bill Savings. The Power One Uses Sloan'S Flushmate Iv Pressure-Assist Flush System, Which Gives A Quieter Flush Than Other Other Conventional, Pressure-Assist Toilets, While Providing A High-Performance, Clog-Free, One-Time Flush That Clears All Waste In The Bowl. Meeting Stringent Epa Watersense Criteria And Offering A 10-Year Warranty On Internal Components, This Is An Ideal Toilet For Both Retrofitting And New Construction.